To solve a problem that the quality of a spun yarn produced with an air spinning apparatus is deteriorated, when the spun yarn is slip on the delivery of the yarn from the air spinning apparatus to a winder.

This air spinning frame unit 10 comprising a draft device 4 for a sliver 1, an air spinning apparatus 5 for producing a spun yarn 2 from the sliver 1 drawn with the draft device 4, a winder 7 for traversing and winding up the spun yarn 2, and a yarn feeder 6 comprising a delivery roller 22 and a nip roller 21 and used for nipping and delivering the spun yarn 2 from the air spinning apparatus 5 to the winder 7 is characterized in that the nip roller 22 is a roller produced from a rubber and having a round cross section, and the delivery roller 21 is a metal roller manufactured by forming many streaky grooves 21a on a roller having a round cross section in parallel in the axial direction.